Teeth Marks and Forensics - Wardisianiwardisiani.com › ... › Lecture-Notes ›...
Transcript of Teeth Marks and Forensics - Wardisianiwardisiani.com › ... › Lecture-Notes ›...
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Teeth Marks and Forensics03/29/2010Forensic Science
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Bell-Ringer
• Bell-Ringer and Journal are due at the end ofclass.
• What is the hardest substance in the body.• Can health history be determined from your
teeth?
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Summary
HistoryBody IdentificationBite Mark AnalysisPersonal Injury/Dental Malpractice
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History
Body Identification Roman Emperor Claudius - wife wanted
decapitated head of mistress Paul Revere – dentures of soldier
Bite Mark Analysis King William - bite in wax
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Anatomy of Oral Cavity:
Maxilla – upper jaw
Mandible – lower jaw
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Anatomy of Oral Cavity
Primary dentition Baby teeth or milk teeth 20 teeth
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Permanent dentition Start at 6-8 years old 32 teeth
Anatomy of Oral Cavity
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Anatomy of Tooth
Crown
Root
Enamel
Pulp
Cementum
Contains DNA
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A body is identified by comparingteeth and bone structures ofthe body to the dental recordsof the suspected individual.
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A body is identified in 3 steps:
1. Postmortem examination of the body
2. Locating the antemortem dental records
3. Comparing the body to the dental records
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Postmortem Examination:
May examination teeth while in the body(if body needed for funeral)
orMay remove jaw (using bone saw) and
remove soft tissue using hydrogenperoxide.
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Postmortem Examination
1. Presence/absence of tooth
Each tooth or socket is examined individually andthe following is recorded:
2. Socket present or healed Healed socket = past removal Present socket = recent removal
3. Erupted vs. Unerupted
4. Filling or Crown Material
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Postmortem Examination
Each tooth or socket is examined individually andthe following is recorded:
Also record any diseasesand the general anatomy.
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Postmortem Examination
After examination of teeth,they should bephotographed and X-raysshould be taken.
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Antemortem Records
If body is known, dental records can usuallybe recovered from his or her dentist.
If body is unknown, the examination resultsare submitted to a missing person registry.
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Comparison
Postmortem exam compared to antemortemrecords.
A statement is made about each tooth:
Different with no explanation
Consistent
Different with explainable differences
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Identification in Mass Disasters:
Split into 4 teams. Run by Chief Forensic Dentist.
1. Recovery at disaster scene.
2. Postmortem exams at morgue.
3. Collect antemortem dental records.
4. Comparisons with computer software.
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Characteristics of Bite Marks:
Usually shape of two half moons (upper/lower)
Usually composed of 6 upper / 6 lower teeth
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Characteristics of Bite Marks:
Antemortem (diffuse bruise)Perimortem (defined bruise)Postmortem (no bruise)
Only persists 8 hours onliving person
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Collection of Bite Marks
1. Identify as potential bite mark2. Collect 3 swabs
3. Photograph bite mark4. Make an impression of bite mark
ABO blood test, amylase detection DNA analysis Microorganism analysis
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Comparison of Bite Marks:
1. Photographic overlay of suspect’s teethand bite mark.
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Comparison of Bite Marks:
2. Compare mold of suspect’s teeth tobite mark or impression of bite mark.